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Can a Main Circuit Breaker Kit be field installed on a QON330L200I OEM Mounting Base?

No, this Main Lug OEM Mounting Base cannot be field converted to a Main Breaker OEM Mounting Base. A main breaker would have to be incorporated into the OEM`s equipment design. The final acceptance of this component is dependent upon its installation and use in complete equipment submitted to Underwriters Laboratories, Inc.